There's a merged pull request on the void-packages repository

higan: add a new implementation of libco for ppc64 ELFv2
https://github.com/void-linux/void-packages/pull/13312
Description: Void uses ELFv2, and thanks to this we no longer need to fall back to the slow sjlj portable implementation.

The patch has been upstreamed: https://github.com/byuu/higan/pull/9